a) Is this is the LVM mailing list? :)
Yes, but you are using a version of LVM that was packaged by Redhat.
b) I don't have money to pay Redhat to tell me they have no idea or that
they only support the version included (1.0.3) the latter being the most
likely response. :)
If you are desperately needing help, try and ask them.
c) I'm asking you ;) lol
Use a stock kernel so the patch from sistina applies cleanly. Or go and use SuSE, version 8.1 ships lvm 1.0.5 (I admit I do not know what the LV size limit is there).